I basically have same needs as bp19406. I'll be taking my Droid X backpacking for two weeks and want some way to charge it.
Last year, I bought this charger http://www.amazon.com/Portable-Battery- ... 758&sr=8-6
. At first I thought it worked okay, but last year I didn't have the Droid X.
I use rechargeable batteries, Energizer and Eneloops. I can only get about a third of a charge from a pair. I'm considering buying a MintyBoost, but am wondering if it would be any better?
At home I have a (supposedly) nice MAHA 8 cell charger. For camping I have a PowerFilm solar charger. I don't know how to tell if either of them are really charging the batteries all the way.
By my calculations, a pair of Energizers should provide 2 x 2500 mAh x 1.2 V = 6000 mWh. My Droid X battery is 1500 mAh x 3.7 V = 5550 mWh. So it should be a close match, but wince I'm only getting about need three pairs of AAs to charge my Droid, I'm estimating only 30% efficiency. The cheap Amazon charger gets quite warm to hold, but now I'm understanding that the MintyBoost will too. I built a cable where I could measure the current to the phone, and with fresh cells it starts out at almost a full amp! (Even though the charger says "max 5V 500mA).
So everybody's advice and experience, please. Would a MintyBoost work significantly better than what I have now?